We only enabled LSC when using vhost-user as the backend, but it is
reported even when using vhost-kernel as the backend.
Fix it by only reportting LSC support when using vhost-user as the
backend.
Fixes: 35c4f8554833 ("net/virtio-user: support to report net status")
Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>
4bf9e26d29